U.S. patent number 10,355,495 [Application Number 15/740,215] was granted by the patent office on 2019-07-16 for non-contact power feeding device.
This patent grant is currently assigned to FUJI CORPORATION. The grantee listed for this patent is FUJI CORPORATION. Invention is credited to Takeshi Nomura, Shinji Takikawa.
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United States Patent |
10,355,495 |
Takikawa , et al. |
July 16, 2019 |
Non-contact power feeding device
Abstract
A non-contact power feeding device includes a power receiving
element in a power receiving-side device, a power receiving circuit
that converts power received by the power receiving element,
generates a motive power voltage and outputs to a motive power
load, and generates a control voltage and outputs to a control
load, a power feeding element that is provided in a power
feeding-side device, an power supply that switches between an
operational frequency during driving of the motive power load and
the control load and a standby frequency during driving of the
control load only, and supplies power to the power feeding element,
frequency detecting sections that detect a power reception
frequency of the power received by the power receiving element, and
a motive power shutoff section that shuts off output of the motive
power voltage when the power reception frequency changes from the
operational frequency to the standby frequency.
Inventors: |
Takikawa; Shinji (Nagoya,
JP), Nomura; Takeshi (Chiryu, JP) |
Applicant: |
Name |
City |
State |
Country |
Type |
FUJI CORPORATION |
Chiryu |
N/A |
JP |
|
|
Assignee: |
FUJI CORPORATION (Chiryu,
JP)
|
Family
ID: |
57609412 |
Appl.
No.: |
15/740,215 |
Filed: |
June 29, 2015 |
PCT
Filed: |
June 29, 2015 |
PCT No.: |
PCT/JP2015/068630 |
371(c)(1),(2),(4) Date: |
December 27, 2017 |
PCT
Pub. No.: |
WO2017/002154 |
PCT
Pub. Date: |
January 05, 2017 |
Prior Publication Data
|
|
|
|
Document
Identifier |
Publication Date |
|
US 20180198287 A1 |
Jul 12, 2018 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H02J
50/80 (20160201); H04B 5/0037 (20130101); H02J
5/005 (20130101); H02J 50/12 (20160201) |
Current International
Class: |
H02J
5/00 (20160101); H04B 5/00 (20060101); H02J
50/80 (20160101); H02J 50/12 (20160101) |
Field of
Search: |
;307/104 ;320/108 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
|
|
|
|
|
8-5679 |
|
Jan 1996 |
|
JP |
|
2008-017652 |
|
Jan 2008 |
|
JP |
|
2013-236484 |
|
Nov 2013 |
|
JP |
|
5472399 |
|
Apr 2014 |
|
JP |
|
5545341 |
|
Jul 2014 |
|
JP |
|
Other References
International Search Report dated Sep. 8, 2015, in
PCT/JP2015/068630 filed Jun. 29, 2015. cited by applicant.
|
Primary Examiner: Barnie; Rexford N
Assistant Examiner: Tran; Thai H
Attorney, Agent or Firm: Oblon, McClelland, Maier &
Neustadt, L.L.P.
Claims
The invention claimed is:
1. A non-contact power feeding device comprising: a power receiving
element that is provided in a power receiving-side device; a power
receiving circuit that converts AC power received by the power
receiving element, generates a motive power voltage and outputs to
a motive power load, and generates a control voltage and outputs to
a control load; a power feeding element that is provided in a power
feeding-side device, which is disposed facing the power
receiving-side device, and feeds AC power in a non-contact manner
by electrically coupling with the power receiving element; an AC
power supply that switches a drive frequency between an operational
frequency during driving of the motive power load and the control
load and a standby frequency during driving of the control load
only, and supplies AC power of the drive frequency to the power
feeding element; a frequency detecting section that detects a power
reception frequency of the AC power received by the power receiving
element; and a motive power shutoff section that shuts off output
of the motive power voltage when the power reception frequency is
outside a predetermined frequency range that includes the
operational frequency or when the power reception frequency is
inside a predetermined frequency range that includes the standby
frequency.
2. The non-contact power feeding device according to claim 1,
further comprising: a resonance element that is connected to at
least one of the power receiving element and the power feeding
element and forms a resonance circuit, wherein the operational
frequency matches a resonance frequency of the resonance
circuit.
3. The non-contact power feeding device according to claim 1,
wherein the control load is driven and a standby state of the power
receiving-side device is maintained when the power reception
frequency is inside the predetermined frequency range that includes
the standby frequency.
4. The non-contact power feeding device according to claim 1,
further comprising: a power reception monitoring section that
determines that there is a power reception abnormality when the
power reception frequency is not inside the predetermined frequency
range that includes the operational frequency or, the predetermined
frequency range that includes the standby frequency.
5. The non-contact power feeding device according to claim 1,
wherein the power receiving circuit includes a rectifier circuit
that converts the AC power received by the power receiving element,
into a DC voltage, a motive power-side power supply circuit that
converts the DC voltage into the motive power voltage, and a
control-side power supply circuit that converts the DC voltage into
the control voltage, the frequency detecting section includes a
pulse conversion circuit that is driven by the control voltage and
converts a waveform of the AC power received by the power receiving
element into a pulse waveform, and a control device that is driven
by the control voltage, counts the number of pulses of the pulse
waveform, and detects the power reception frequency, and the
control device also serves as the motive power shutoff section that
controls the motive power-side power supply circuit to stop on the
basis of the detected power reception frequency.
6. The non-contact power feeding device according to claim 1,
wherein the power receiving circuit includes a rectifier circuit
that converts the AC power received by the power receiving element
into a DC voltage, a motive power-side power supply circuit that
converts the DC voltage into the motive power voltage, and a
control-side power supply circuit that converts the DC voltage into
the control voltage, the frequency detecting section is a relay
control circuit that outputs a shutoff instruction when the power
reception frequency is outside the predetermined frequency range
that includes the operational frequency or when the power reception
frequency is inside the predetermined frequency range that includes
the standby frequency, and the motive power shutoff section is an
opening/closing relay that is connected in series to an input side
or an output side of the motive power-side power supply circuit and
is shut off by the shutoff instruction.
Description
TECHNICAL FIELD
The present application relates to a non-contact power feeding
device that feeds power in a non-contact manner from a power
feeding-side device to a power receiving-side device, which has a
motive power load and a control load.
BACKGROUND ART
A solder printing machine, a component mounting machine, a reflow
machine, and a board inspection machine, and the like, are examples
of equipment that produces boards on which multiple components are
mounted. Generally, a board production line is configured by
linking such equipment. Among such equipment, the component
mounting machine is generally provided with a board conveyance
device, a component supply device, a component transfer device, and
a control device. A feeder device having a system that reels out a
tape on which a plurality of electronic component are stored at a
predetermined pitch is a representative example of a component
supply device. A feeder device is configured to have a flattened
shape that is thin in the width direction, and a plurality thereof
are linearly arranged on a device table of a component mounting
machine. A feeder device has a motive power load such as a motor in
a mechanism section that supplies a component, and has a control
load such as a microcomputer or a sensor that controls the motive
power load.
In the related art, multi-terminal connectors having a contact
power feeding system have been used in order to feed power to a
feeder device from a main body of a component mounting machine.
However, in a multi-terminal connector, there is a concern of
deformation, damage, or the like, to the terminals due to the
repetition of a removal/insertion manipulation. In recent years,
the use of non-contact power feeding devices such as an
electromagnetic coupling system, a capacitive coupling system, or
the like, has been implemented as a countermeasure. Additionally,
the application of non-contact power feeding devices is not limited
to feeder devices of component mounting machine, and includes a
broad range of fields such as board production facilities,
assembling machines that produce other product, processing
machines, and the like. In addition, a power receiving-side device,
which is fed power in a non-contact manner, having a motive power
load and a control load is also an ordinary matter. Technical
examples relating to such non-contact power feeding devices are
disclosed in PTL 1 and 2.
A wireless power feeding device of PTL 1 is a device that
wirelessly supplies power to a power receiving coil from a power
feeding coil, the device being characterized in that a resonance
frequency is set to an Industry-Science-Medical (ISM) frequency
band, and a current is supplied by alternately switching first and
second switching transistors. According to such a configuration, it
is possible to enhance the electric power transmission efficiency
of a magnetic resonance type wireless power feeding, and therefore,
it is possible to suppress the number of coils required.
In addition, the wireless power feeding device of PTL 2 is a device
that wirelessly supplies power to a power receiving coil from a
power feeding coil, the device being characterized by being
provided with a resonance circuit that includes a first coil and a
capacitor that are connected in series, a power supply control
circuit that causes the resonance circuit to resonate by
alternately electrically connecting first and second switches, and
an effective signal generation circuit that generates an effective
signal for setting drive periods and a stop periods of the first
and second switches, and the power supply control circuit
continuing a resonance state by performing feedback control of the
first and second switches in the drive periods. According to such a
configuration, a magnetic resonance type wireless power feeding
technique in which it is possible to realize a drive system of a
power feeding coil by using a simple configuration is
constituted.
CITATION LIST
Patent Literature
PTL 1: Japanese Patent No. 5472399
PTL 2: Japanese Patent No. 5545341
SUMMARY
Technical Problem
It should be noted that in general non-contact power feeding
devices other than PTL 1 and 2, when operation of a power
receiving-side device is temporarily stopped, non-contact power
feeding is interrupted, a motive power voltage is lost, and a
motive power load is stopped. In this case, a control voltage is
also lost, and the control load is also stopped. Therefore, when
non-contact power feeding is resumed, a time for the control load
to rise, for example, a loading time of a microcomputer is
required, and therefore, restart of the power receiving-side device
is delayed. Furthermore, information required for control is lost,
and there is a concern that it will be difficult to restart the
power receiving-side device smoothly. Such problems occur each time
non-contact power feeding is interrupted and resumed. Accordingly,
it is preferable that at least the control load be continuously
driven when operation of the power receiving-side device is
temporarily stopped.
The present disclosure has been devised in the light of the
above-mentioned problems of the background art, and a problem to be
solved thereof is to provide a non-contact power feeding device
that is configured to be capable of stopping a motive power load
and continuously driving a control load by continuing non-contact
power feeding when operation of the power receiving-side device is
temporarily stopped, and thereby performing rapid and smooth
restart of the power receiving-side device.
Solution to Problem
A non-contact power feeding device of the present disclosure that
solves the above-mentioned problems is provided with a power
receiving element that is provided in a power receiving-side
device, a power receiving circuit that converts AC power received
by the power receiving element, generates a motive power voltage
and outputs to a motive power load, and generates a control voltage
and outputs to a control load, a power feeding element that is
provided in a power feeding-side device, which is disposed facing
the power receiving-side device, and feeds AC power in a
non-contact manner by electrically coupling with the power
receiving element, an AC power supply that switches a drive
frequency between an operational frequency during driving of the
motive power load and the control load and a standby frequency
during driving of the control load only, and supplies AC power of
the drive frequency to the power feeding element, a frequency
detecting section that detects a power reception frequency of the
AC power received by the power receiving element, and a motive
power shutoff section that shuts off output of the motive power
voltage when the power reception frequency is outside a
predetermined frequency range that includes the operational
frequency or when the power reception frequency is inside a
predetermined frequency range that includes the standby
frequency.
Advantageous Effects
In the non-contact power feeding device of the present disclosure,
the drive frequency of an AC power supply of the power feeding-side
device is switched between the operational frequency and the
standby frequency, and a frequency detecting section and a motive
power shutoff section are provided in the power receiving-side
device. Therefore, the non-contact power feeding device performs
non-contact power feeding using the operational frequency at normal
times, and switches the drive frequency to the standby frequency by
using the power feeding-side device when operation of the power
receiving-side device is temporarily stopped. Considering this, in
the power receiving-side device, it is possible to detect switching
of the frequency, shut off output of the motive power voltage and
stop the motive power load, and it is also possible to continuously
drive the control load by using non-contact power feeding using the
standby frequency. Further, when the power receiving-side device is
restarted, if the drive frequency is returned to the operational
frequency by using the power feeding-side device, the motive power
voltage is restored in the power receiving-side device. Moreover,
time for the control load to rise is not required, and there is not
a concern that information required in control will be lost.
Accordingly, restart of the power receiving-side device can be
performed rapidly and smoothly.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a block diagram that shows a configuration of a
non-contact power feeding device of a first embodiment of the
present disclosure, and shows a partial circuit configuration.
FIG. 2 is a view that shows frequency properties of non-contact
power feeding performance of the non-contact power feeding
device.
FIG. 3 is a view that shows a control flow of a control device of a
power receiving-side device.
FIG. 4 is a block diagram that shows a configuration of a
non-contact power feeding device of a second embodiment, and shows
a partial circuit configuration.
DESCRIPTION OF EMBODIMENTS
(1. Configuration of Non-Contact Power Feeding Device 1 of First
Embodiment)
A non-contact power feeding device 1 of a first embodiment of the
present disclosure will be described below with reference to FIGS.
1 to 3. FIG. 1 is a block diagram that shows a configuration of the
non-contact power feeding device 1 of the first embodiment of the
present disclosure, and shows a partial circuit configuration. The
non-contact power feeding device 1 feeds AC power in a non-contact
manner from a power feeding-side device 1A to a power
receiving-side device 1B. As shown in FIG. 1, the power
feeding-side device 1A and the power receiving-side device 1B are
used in a manner in which the two are disposed facing one another.
The positional relationship between the power feeding-side device
1A and the power receiving-side device 1B may be capable of
relative displacement, or not capable of relative displacement. The
non-contact power feeding device 1 is provided with an AC power
supply 2, a power feeding coil 31, and a power feeding-side
capacitor 35 in the power feeding-side device 1A. The non-contact
power feeding device 1 is further provided with a power receiving
coil 41, a power receiving-side capacitor 45, a power receiving
circuit 5, a pulse conversion circuit 72, and a control device 73
in the power receiving-side device 1B.
The AC power supply 2 of the power feeding-side device 1A is
configured by a DC power supply section 21, a positive side
switching element 22, a negative side switching element 23, a
frequency control section, which is not illustrated in the
drawings, and the like. The DC power supply section 21 outputs a
power supply voltage Vdc. The positive side switching element 22
and the negative side switching element 23 configure a half bridge
circuit, convert the power supply voltage Vdc to AC power and
output the AC power. The frequency control section controls the
drive frequency fD of the AC power.
A high-voltage terminal 21P of the DC power supply section 21 is
connected to a high-voltage terminal 221 of the positive side
switching element 22. A low-voltage terminal 222 of the positive
side switching element 22 is connected to a high-voltage terminal
231 of the negative side switching element 23 and one end 351 of
the power feeding-side capacitor 35. A low-voltage terminal 232 of
the negative side switching element 23 is connected to a
low-voltage terminal 21N of the DC power supply section 21.
The frequency control section alternately outputs a control signal
to a control terminal 223 of the positive side switching element 22
and a control terminal 233 of the negative side switching element
23. As a result of this, AC power is output due to the action of
the half bridge circuit. Furthermore, the frequency control section
switches the drive frequency fD of the AC power between an
operational frequency fM and a standby frequency fC by controlling
a delivery interval of the control signal. The operational
frequency fM is a frequency for driving a motive power load and a
control load at normal times during which the power receiving-side
device 1B is activated. The standby frequency fC is a frequency for
driving the control load when standing by due to operation of the
power receiving-side device 1B being temporarily stopped.
The operational frequency fM is defined as a resonance frequency
during a heavy load of a resonance circuit that is formed by the
power feeding coil 31, the power feeding-side capacitor 35, the
power receiving coil 41, the power receiving-side capacitor 45, and
the like (mentioned in more detail later). The operational
frequency fM and the standby frequency fC are preferably of an
extent of a few tens of kHz to a few hundreds of kHz, but need not
necessarily be limited to this frequency range.
The other end 352 of the power feeding-side capacitor 35 is
connected to one end 311 of the power feeding coil 31. The power
feeding coil 31 is one form of a power feeding element. The power
feeding-side capacitor 35 is a resonance element that is connected
in series to the power feeding coil 31 and forms a resonance
circuit. The other end 312 of the power feeding coil 31 is
connected to the low-voltage terminal 232 of the negative side
switching element 23. As a result of this, a closed power feeding
circuit of the power feeding-side device 1A is configured.
The power receiving coil 41 of the power receiving-side device 1B
is disposed facing the power feeding coil 31 of the power
feeding-side device 1A. The power receiving coil 41 and the power
feeding coil 31 electromagnetically couple with one another, mutual
inductance is generated, and non-contact power feeding becomes
possible. The power receiving coil 41 is one form of a power
receiving element. One end 411 of the power receiving coil 41 is
connected to one end 451 of the power receiving-side capacitor 45
and one end 511 of a rectifier circuit 51 that configures the power
receiving circuit 5. The other end 412 of the power receiving coil
41 is connected to the other end 452 of the power receiving-side
capacitor 45 and the other end 512 of the rectifier circuit 51. The
power receiving-side capacitor 45 is a resonance element that is
connected in parallel to the power receiving coil 41 and forms a
resonance circuit.
The power receiving circuit 5 is configured to include the
rectifier circuit 51, a motive power-side power supply circuit 52,
and a control-side power supply circuit 53. The rectifier circuit
51 rectifies the AC power received by the power receiving coil 41
by non-contact power feeding, converts the AC power to a DC voltage
Vout, and outputs the DC voltage Vout to the motive power-side
power supply circuit 52 and the control-side power supply circuit
53. A full-wave rectifier circuit in which four rectifier diodes
are bridge connected can be included as an illustrative example of
the rectifier circuit 51.
The motive power-side power supply circuit 52 converts the DC
voltage Vout to a motive power voltage VM and outputs the motive
power voltage VM to the motive power load. FIG. 1 illustrates a
motor 61 and an amplifier 62 as an example of a motive power load.
A direct current of 48 V is an illustrative example of the motive
power voltage VM. The control-side power supply circuit 53 converts
the DC voltage Vout to a control voltage VC and outputs the control
voltage VC to the control load. FIG. 1 illustrates sensors 63 as an
example of a control load. The pulse conversion circuit 72 and the
control device 73 correspond to the control load. A direct current
of 24 V or a direct current of 5 V, which are lower than the motive
power voltage VM are illustrative examples of the control voltage
VC. In addition, a switching system or dropper system DC-DC
converter is an illustrative example of the motive power-side power
supply circuit 52 and the control-side power supply circuit 53.
A frequency detection transformer 71 is electrically coupled to a
line that connects the other end 412 of the power receiving coil 41
and the other end 452 of the power receiving-side capacitor 45. The
frequency detection transformer 71 transforms the waveform of the
AC power received by the power receiving coil 41 in an AC detection
waveform Wac, and outputs to the pulse conversion circuit 72. The
pulse conversion circuit 72 has comparator. The comparator outputs
a high level in time slots in which the AC detection waveform Wac
is equal to a predetermined voltage or more, and outputs a low
level in time slots in which the AC detection waveform is less than
the predetermined voltage. As a result of this, the pulse
conversion circuit 72 outputs a pulse waveform Wp composed of two
values of high and low to the control device 73.
The control device 73 is an electronic control system device that
has a CPU and operates by using software. The control device 73
counts the number of pulses N of the pulse waveform Wp and detects
the power reception frequency fR. Accordingly, the frequency
detection transformer 71, the pulse conversion circuit 72, and the
control device 73 carry out the function of the frequency detecting
section of the present disclosure. In addition, the control device
73 outputs a motive power control signal SC and controls operation
and stopping of the motive power-side power supply circuit 52.
Accordingly, the control device 73 carries out a function of the
motive power shutoff section of the present disclosure. The
detailed functions of the control device 73 will be mentioned later
together with the operations of the non-contact power feeding
device 1.
Next, the frequency properties of the non-contact power feeding
device 1 will be described. FIG. 2 is a view that shows frequency
properties of non-contact power feeding performance of the
non-contact power feeding device 1. The horizontal axis of FIG. 2
represents the drive frequency fD of the AC power supply 2, and the
vertical axis represents the DC voltage Vout output from the
rectifier circuit 51. In addition, the solid line represents
frequency properties during a heavy load of driving the motive
power load and the control load, and the broken line represents
frequency properties during a light load of driving the control
load only.
According to the frequency properties during the heavy load, the
resonance frequency of the resonance circuit shown by the peak in
the waveform matches the operational frequency fM. Accordingly, a
maximum DC voltage Vout1 is obtained when the drive frequency fD is
made to match the operational frequency fM. While the DC voltage
Vout1 is being input to the motive power-side power supply circuit
52 and the control-side power supply circuit 53, the motive power
voltage VM and the control voltage VC are generated, and the motive
power load and the control load are driven.
In this instance, the power supply voltage Vdc of the DC power
supply section 21 is adjusted so that the DC voltage Vout1 is
slightly higher than the motive drive voltage VM. As a result of
this adjustment, the circuit configuration of the motive power-side
power supply circuit 52 is simplified, and favorable power supply
efficiency is obtained. If a configuration in which the DC voltage
Vout1 can become lower than the motive drive voltage VM is used, it
is necessary to provide the motive power-side power supply circuit
52 with a boosting function and the circuit configuration is more
complex. In addition, generally, high power supply efficiency is
obtained when a voltage difference between the DC voltage Vout1 on
the input side of the motive power-side power supply circuit 52 and
the motive drive voltage VM on the output side thereof is small.
The power supply efficiency of the motive power-side power supply
circuit 52 decreases if the DC voltage Vout1 is considerably higher
than the motive drive voltage VM.
Meanwhile, according to the frequency properties during the light
load, the resonance frequency of the resonance circuit shown by the
peaks in the waveform is generated in two locations above and below
the operational frequency fM. Further, the standby frequency fC is
set further on the upper side than the resonance frequency on the
upper side of the operational frequency fM. A DC voltage Vout2 is
obtained when the drive frequency fD is made to match the standby
frequency fC. While the DC voltage Vout2 is being input to the
control-side power supply circuit 53, the control voltage VC is
generated, and the control load is driven. However, even if the DC
voltage Vout2 is input to the motive power-side power supply
circuit 52, generation of the motive power voltage VM is not
guaranteed.
(2. Operations and Actions of Non-Contact Power Feeding Device 1 of
First Embodiment)
Next, the operations and actions of the non-contact power feeding
device 1 of the first embodiment will be described. In the
above-mentioned manner, the frequency control section of the AC
power supply 2 controls the drive frequency fD to the operational
frequency fM at normal times when the power receiving-side device
1B is activated. In addition, there are cases in which operation of
the power receiving-side device 1B is temporarily stopped to ensure
safety and for other reasons when an operator accesses the power
receiving-side device 1B. In this case, the frequency control
section of the AC power supply 2 controls the drive frequency fD to
switch to the standby frequency fC. Meanwhile, the control device
73 of the power receiving-side device 1B performs the control that
is shown in FIG. 3.
FIG. 3 is a view that shows a control flow of the control device 73
of the power receiving-side device 1B. In Step S1 of FIG. 3, the
control device 73 counts, for a predetermined time T, the number of
pulses N of the pulse waveform Wp input from the pulse conversion
circuit 72. In the subsequent Step S2, the control device 73
divides the obtained number of pulses N by the predetermined time T
and calculates the power reception frequency fR. In the subsequent
Step S3, the control device 73 determines whether or not the power
reception frequency fR substantially matches the operational
frequency fM. In other words, the control device 73 determines
whether or not the power reception frequency fR is inside a
predetermined frequency range that includes the operational
frequency fM. The control device 73 advances the execution of the
control flow to Step S4 when the power reception frequency fR
substantially matches the operational frequency fM, and advances
the execution of the control flow to Step S5 when this is not the
case.
The maximum DC voltage Vout1 is obtained in the state of Step S4.
At this time, if the motive power-side power supply circuit 52 is
stopped, the control device 73 outputs the motive power control
signal SC and operates the motive power-side power supply circuit
52. Accordingly, the control device 73 controls the operation of
the motive power load such as the motor 61 and the amplifier 62, or
the like, and it is possible to activate the power receiving-side
device 1B. Thereafter, one cycle of the control flow ends after a
defined period of time elapses and the control device 73 returns
the execution of the control flow to Step S1.
In Step S5, the control device 73 determines whether or not the
power reception frequency fR substantially matches the standby
frequency fC. In other words, the control device 73 determines
whether or not the power reception frequency fR is inside a
predetermined frequency range that includes the standby frequency
fC. The control device 73 advances the execution of the control
flow to Step S6 when the power reception frequency fR substantially
matches the standby frequency fC, and advances the execution of the
control flow to Step S8 when this is not the case.
The DC voltage Vout2 is obtained in the state of Step S6.
Accordingly, the control device 73 is continuously activated and
controls the motive power-side power supply circuit 52 to stop by
using the motive power control signal SC. As a result of this, the
motive power voltage VM is no longer generated, and the motive
power load is stopped. In Step S7, the control device 73 maintains
a standby state of the power receiving-side device 1B and prepares
for restart. Thereafter, one cycle of the control flow ends after a
defined period of time elapses and the control device 73 returns
the execution of the control flow to Step S1.
In Step S8, the power reception frequency fR does not match the
operational frequency fM or the standby frequency fC. Accordingly,
the control device 73 determines that there is a power reception
abnormality and outputs a warning. In other words, the control
device 73 has a function of the power reception monitoring section
of the present disclosure. In this instance, the frequency control
section of the AC power supply 2 generally has a frequency
difference that is caused by a temperature dependency property,
age-based property changes, or the like. Accordingly, it is
preferable to determine that the power reception frequency fR
matches the operational frequency fM and the standby frequency fC
in each steps S3 and S5, with the predetermined frequency ranges
that are set to be slightly greater than the frequency
difference.
According to the above-mentioned control flow, when operation of
the power receiving-side device 1B is temporarily stopped, the
control load is continuously driven by non-contact power feeding
using the standby frequency fC. Accordingly, it is possible for the
control device 73 to maintain a standby state, and there is not a
concern that information required for control will be lost.
Further, when the drive frequency fD is returns to the operational
frequency fM, the motive power voltage VM is restored in the power
receiving-side device 1B. In addition, the control device 73 can
start control of the operations of the motive power load
immediately from the standby state.
(3. Aspects and Effects of Non-Contact Power Feeding Device 1 of
First Embodiment)
The non-contact power feeding device 1 of the first embodiment is
provided with the power receiving coil 41 that is provided in the
power receiving-side device 1B, the power receiving circuit 5 that
converts AC power received by the power receiving coil 41,
generates the motive power voltage VM and outputs to the motive
power load (the motor 61 and the amplifier 62), and generates the
control voltage VC and outputs to the control load (the sensors 63,
the pulse conversion circuit 72, and the control device 73), the
power feeding coil 31 that is provided in the power feeding-side
device 1A, which is disposed facing the power receiving-side device
1B, and feeds AC power in a non-contact manner by electrically
coupling with the power receiving coil 41, the AC power supply 2
that switches the drive frequency fD between the operational
frequency fM during driving of the motive power load and the
control load and a standby frequency fM during driving of the
control load only, and supplies AC power of the drive frequency fD
to the power feeding coil 31, a frequency detecting section (the
frequency detection transformer 71, the pulse conversion circuit
72, and the control device 73) that detects the power reception
frequency fR of the AC power received by the power receiving coil
41, and a motive power shutoff section (the control device 73) that
shuts off output of the motive power voltage VM when the power
reception frequency fR is outside a predetermined frequency range
that includes the operational frequency fM or when the power
reception frequency fR is inside a predetermined frequency range
that includes the standby frequency fC.
According to this configuration, the non-contact power feeding
device 1 performs non-contact power feeding using the operational
frequency fM at normal times, and switches the drive frequency fD
to the standby frequency fC by using the power feeding-side device
1A when operation of the power receiving-side device 1B is
temporarily stopped. Considering this, in the power receiving-side
device 1B, it is possible to detect switching of the frequency,
shut off output of the motive power voltage VM and stop the motive
power load, and it is also possible to continuously drive the
control load by using non-contact power feeding using the standby
frequency fC. Further, when the power receiving-side device is
restarted, if the drive frequency fD is returned to the operational
frequency fM by using the power feeding-side device 1A, the motive
power voltage VM is restored in the power receiving-side device 1B.
In addition, time for the control load to rise is not required, and
there is not a concern that information required in control will be
lost. Accordingly, restart of the power receiving-side device 1B
can be performed rapidly and smoothly.
Furthermore, the non-contact power feeding device further includes
a resonance element (the power receiving-side capacitor 45 and the
power feeding-side capacitor 35) that is connected to at least one
of the power receiving coil 41 and the power feeding coil 31 and
forms a resonance circuit, and the operational frequency fM matches
the resonance frequency of the resonance circuit during a heavy
load. According to this configuration, the maximum DC voltage Vout1
is obtained during a heavy load and the power feeding efficiency of
non-contact power feeding is enhanced.
Furthermore, the control load is driven and a standby state of the
power receiving-side device 1B is maintained when the power
reception frequency fR is inside the predetermined frequency range
that includes the standby frequency fC. According to this
configuration, when the drive frequency fD is returned to the
operational frequency fM and non-contact power feeding is resumed,
the control device 73 can start control of the operations of the
motive power load immediately from the standby state. Accordingly,
the effect of being capable of performing restart of the power
receiving-side device 1B rapidly and smoothly is considerable and
can be reliably obtained.
Furthermore, the non-contact power feeding device further includes
a power reception monitoring section (the control device 73) that
determines that there is a power reception abnormality when the
power reception frequency fR is not inside the predetermined
frequency range that includes the operational frequency fM or the
predetermined frequency range that includes the standby frequency
fC. According to this configuration, a monitoring function related
to non-contact power feeding is provided, and therefore,
reliability is improved.
Furthermore, the power receiving circuit 5 includes the rectifier
circuit 51 that converts the AC power received by the power
receiving coil 41 into the DC voltage Vout, the motive power-side
power supply circuit 52 that converts the DC voltage Vout into the
motive power voltage VM, and the control-side power supply circuit
53 that converts the DC voltage Vout into the control voltage VC,
the frequency detecting section includes the pulse conversion
circuit 72 that is driven by the control voltage VC and converts
the waveform (the AC detection waveform Wac) of the AC power
received by the power receiving coil 41 into the pulse waveform Wp,
and the control device 73 that is driven by the control voltage VC,
counts the number of pulses N of the pulse waveform Wp, and detects
the power reception frequency fR, and the control device 73 also
serves as the motive power shutoff section that controls the motive
power-side power supply circuit 52 to stop on the basis of the
detected power reception frequency fR. According to this
configuration, it is possible to realize the frequency detecting
section and the motive power shutoff section of the present
disclosure by using a simple circuit configuration.
Moreover, it is possible to reduce electrical loss that is
generated in the power receiving-side device 1B when operation of
the power receiving-side device 1B is temporarily stopped and the
standby state is used. The first reason for this is that loss
caused by the motive power-side power supply circuit 52 being
stopped is no longer generated. If the control device 73 only
controls the operation of the motive power load to stop, loss of
the motive power-side power supply circuit 52 is not prevented. The
second reason for this is that in the control-side power supply
circuit 53, the DC voltage Vout1 on the input side is reduced to
the DC voltage Vout2 and approaches the control voltage VC on the
output side, and therefore, power supply efficiency is
enhanced.
(4. Non-Contact Power Feeding Device 10 of Second Embodiment)
Next, a non-contact power feeding device 10 of a second embodiment
of the present disclosure will be described focusing on the
differences from the first embodiment. FIG. 4 is a block diagram
that shows a configuration of the non-contact power feeding device
10 of the second embodiment, and shows a partial circuit
configuration. In the second embodiment, the configurations of the
frequency detecting section and the motive power shutoff section
are different from the first embodiment and the other portions are
similar to those of the first embodiment.
In the second embodiment, the frequency detecting section is
configured by the frequency detection transformer 71 and a relay
control circuit 74. The frequency detection transformer 71
transforms the voltage waveform of the AC power received by the
power receiving coil 41 into the AC detection waveform Wac, and
outputs the AC detection waveform Wac to the relay control circuit
74. The relay control circuit 74 is driven by the control voltage
VC and detects the power reception frequency fR of the AC detection
waveform Wac. Furthermore, the relay control circuit 74 outputs a
shutoff instruction SR to an electromagnetic opening/closing relay
75 when the power reception frequency fR is outside the
predetermined frequency range that includes the operational
frequency fM or when the power reception frequency fR is inside the
predetermined frequency range that includes the standby frequency
fC.
In the second embodiment, the electromagnetic opening/closing relay
75 is used in the motive power shutoff section. The electromagnetic
opening/closing relay 75 is connected in series between the output
side of the motive power-side power supply circuit 52 and the
motive power load. However, the configuration is not limited to
this, and the electromagnetic opening/closing relay 75 may be
connected in series to the input side of the motive power-side
power supply circuit 52. The electromagnetic opening/closing relay
75 is normally closed and is opened and interrupted by the shutoff
instruction SR.
In the non-contact power feeding device 10 of the second
embodiment, the power receiving circuit 5 includes the rectifier
circuit 51 that converts the AC power received by the power
receiving coil 41 into the DC voltage Vout, the motive power-side
power supply circuit 52 that converts the DC voltage Vout into the
motive power voltage VM, and the control-side power supply circuit
53 that converts the DC voltage Vout into the control voltage VC,
the frequency detecting section is the relay control circuit 74
that outputs the shutoff instruction when the power reception
frequency fR is outside the predetermined frequency range that
includes the operational frequency fM or when the power reception
frequency fR is inside the predetermined frequency range that
includes the standby frequency fC, and the motive power shutoff
section is the electromagnetic opening/closing relay 75 that is
connected in series to the input side or the output side of the
motive power-side power supply circuit 52 and is shut off by the
shutoff instruction SR.
The actions and effects of the non-contact power feeding device 10
of the second embodiment are similar to those of the first
embodiment, and therefore, description thereof has been
omitted.
(5. Application and Modification of Embodiments)
Additionally, the system of the non-contact power feeding is not
limited to an electromagnetic coupling system that uses the power
feeding coil 31 and the power receiving coil 41, and for example, a
capacitive coupling system that uses a power feeding electrode and
a power receiving electrode may also be used. In addition, in the
first embodiment, the control device 73 may be provided to also
serve a function of a control section that controls the operations
of the motor 61 and the amplifier 62. Furthermore, in the second
embodiment, it is also possible to provide the relay control
circuit 74 with a function of a power reception monitoring section.
Various other applications and modifications are also possible in
the present disclosure.
INDUSTRIAL APPLICABILITY
The non-contact power feeding device of the present disclosure can
be used in assembling machines, processing machines, and the like,
in various fields that perform the assembly, processing, and the
like, of products.
REFERENCE SIGNS LIST
1, 10: non-contact power feeding device, 1A: power feeding-side
device, 1B: power receiving-side device, 2: AC power supply, 31:
power feeding coil, 35: power feeding-side capacitor, 41: power
receiving-side coil, 45: power receiving-side capacitor, 5: power
receiving circuit, 51: rectifier circuit, 52: motive power-side
power supply circuit, 53: control-side power supply circuit, 61:
motor (motive power load), 62: amplifier (motive power load), 63:
sensors (control load), 72: pulse conversion circuit, 73: control
device, 74: relay control circuit, 75: electromagnetic
opening/closing relay, VM: motive power voltage, VC: control
voltage, Vout: DC voltage, fM: operational frequency, fC: standby
frequency
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